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Test Methods For Scrub Resistance

2018-01-25 15:23
DIN ISO Methods
The Standards EN ISO 11998 and DIN EN 13330 (replaced DIN 53778) describe procedures to evaluate the resistance of coatings 
against abrasion by cleaning or scrubbing the surface. The coating is applied on a foil and dried under standard conditions. In order to describe the cleanability, defined pollutions are applied onto the surface before starting the test.
DIN 53 778 (*withdrawn 08/2007): Dispersion Paints Cleanability: Test area should be free of pollutions Wash resistance: Evaluation after 1000 scrub cycles Scrub resistance: Evaluation after 5000 scrub cycles The test is performed wet using a hog bristle brush and a pump to apply the washing liquid. The evaluation is done visually.
DIN EN 13300This standard describes the various testing methods for waterborne coating materials and coating systems for interior walls and ceilings. One quality criterion mentioned is the wet-abrasion resistance tested in accordance to EN ISO 11998. Additionally, a rating scale dependent on the amount of abrasion is used for  final classification.
ISO 11998
The ISO test method describes a short version of the scrub abrasion test. This test uses “3M Scotch Brite 7448“ pads and the washing liquid is manually applied before starting the test. The test is finished for evaluation after 200 scrub-cycles. The evaluation of the wash/scrub resistance is done by calculating the loss of mass.
ASTM Methods
The Wet Abrasion Scrub Tester is designed to comply with four ASTM methods.
ASTM D 2486 The scrub resistance of interior wall paint is the primary purpose of this method. The paint is applied to a black plastic panel and allowed to cure. The panel is scrubbed with a nylon bristle brush until failure occurs. An abrasive scrub media is used to accelerate the test.
ASTM D 3450 This test method determines the ease of removing soilant discoloration from interior coatings. The coating is drawdown on a black plastic panel and allowed to dry for seven days. A specified soilant medium is applied. The coating is scrubbed with an abrasive or non-abrasive media using a cellulosic type sponge for 100 cycles. The soilant removal is assessed by measuring the CIE Y reflectance before and after the test.
ASTM D 4213 The purpose of this method is to measure scrub resistance.The primary differences from ASTM D 2486 method are: The scrub resistance is determined by weight loss of the paint film relative to a standard calibration panel. The test panel and calibration panel are scrubbed simultaneously. The scrubbing device is a ScotchBrite™7448 abrasive pad.
ASTM D 4828 This test method determines the relative ease of removing soil and stains from interior coatings. The coating is applied to a black plastic panel and dried for seven days. The soilant can be user defined or the soilant described in ASTM D 3450 can also be used. A user defined liquid or powder cleaner is applied. The panel is scrubbed 100 cycles with a sponge. The soilant removal is assessed using gloss or color measurement.

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